"It is only the devil who would make (men) fear his partisans. Fear them not; fear Me, if ye are true believers."
 

(Holy Qur'an (Pickthall) 3:175)

"O mankind! do your duty to your Lord, and fear (the coming of) a Day when no father can avail aught for his son, nor a son avail aught for his father. Verily, the promise of God is true: let not then this present life deceive you, nor let the chief Deceiver deceive you about God."
 

(Holy Qur'an (Yusufali) 31:33)

"Say: "O ye my servants who believe! Fear your Lord, good is (the reward) for those who do good in this world. Spacious is God's earth! those who patiently persevere will truly receive a reward without measure!""
 

(Holy Qur'an (Yusufali) 39.10)

"Man often wrongly claims that he relies only upon God. But, by the Great God, his actions belie (contradict) him and his belief. Actions of every man naturally disclose what he expects as reaction in form of rewards or punishments. But so far his faith in God is concerned, it is found that his belief in God and His justice is neither unmixed or sincere. Man appears to be affected by every kind of fear except fear of God. It appears as if fear of God has been accorded a secondary importance by him. Obviously man should expect great rewards from God and smaller returns from his fellow beings and yet he serves man more sincerely, vigorously and diligently than God.
 
Where God is concerned man's behaviour is most surprising. He grudges to God what he willingly and sincerely offers to man. O man! Are you afraid that your fellow beings will not reward you unless you work for them more faithfully and persistently than you work for God, or, is it that you do not expect to find any source of reward more genuine, objective and real from a man like yourself?
 
Similar is the phenomena of human mind when he is afraid of another individual or society of his fellow beings; this fear in him manifests itself more strikingly than the fear of God. Why is this so? Does man's belief in displeasure and anger of another man is more sincere, convincing and forceful than his belief in the Wrath of God? Does he believe that anger of man will bear immediate results and Wrath of God is merely hearsay or something which may or may not take effect in some distant or uncertain future?
 
Identical is the case of those who attach undue importance to this world and have allowed great significance to it. They show more respect and regard to it than to God the Almighty, and they attach themselves to it and become its slaves."
 

(Nahjul Balagha: Sermons, letters and saying of Hazrat Ali (Second American edition, 1981), Khutba 163, p. 122-123)